Graphs are commonly used in machine learning to model relationships between instances. Consider the task of predicting the political preferences of users in a social network; to solve this task one should consider, both, the features of each individual user and the relationships between them. However, oftentimes one is not interested in the label of a single instance but rather in the distribution of labels over a set of instances; e.g., when predicting the political preferences of users, the overall prevalence of a given opinion might be of higher interest than the opinion of a specific person. This label prevalence estimation task is commonly referred to as quantification learning (QL). Current QL methods for tabular data are typically based on the so-called prior probability shift (PPS) assumption which states that the label-conditional instance distributions should remain equal across the training and test data. In the graph setting, PPS generally does not hold if the shift between training and test data is structural, i.e., if the training data comes from a different region of the graph than the test data. To address such structural shifts, an importance sampling variant of the popular adjusted count quantification approach has previously been proposed. In this work, we extend the idea of structural importance sampling to the state-of-the-art KDEy quantification approach. We show that our proposed method adapts to structural shifts and outperforms standard quantification approaches.

A first-order method for nonconvex-strongly-concave constrained minimax optimization Zhaosong Lu Sanyou Mei May 12, 2024 (Revised: October 23, 2025) Abstract In this paper we study a nonconvex-strongly-concave constrained minimax problem. Specifically, we propose a first-order augmented Lagrangian method for solving it, whose subproblems are nonconvex-strongly-concave unconstrained minimax problems and suitably solved by a first-order method developed in this paper that leverages the strong concavity structure. Under suitable assumptions, the proposed method achieves an operation complexity of O(ε 3.5 log ε 1), measured in terms of its fundamental operations, for finding an ε-KKT solution of the constrained minimax problem, which improves the previous best-known operation complexity by a factor of ε 0.5 . Keywords: minimax optimization, augmented Lagrangian method, first-order method, operation complexity Mathematics Subject Classification: 90C26, 90C30, 90C47, 90C99, 65K05 1 Introduction In this paper, we consider a nonconvex-strongly-concave constrained minimax problem F = min c(x) 0 max d(x,y) 0 {F (x,y):= f (x, y) + p(x) q(y)}. Assume that problem (1) has at least one optimal solution and the following additional assumptions hold.

Jensen Huang Says Nvidia's New Vera Rubin Chips Are in'Full Production' The chip giant says Vera Rubin will sharply cut the cost of training and running AI models, strengthening the appeal of its integrated computing platform. Nvidia CEO Jensen Huang says that the company's next-generation AI superchip platform, Vera Rubin, is on schedule to begin arriving to customers later this year. "Today, I can tell you that Vera Rubin is in full production," Huang said during a press event on Monday at the annual CES technology trade show in Las Vegas. Rubin will cut the cost of running AI models to about one-tenth of Nvidia's current leading chip system, Blackwell, the company told analysts and journalists during a call on Sunday. Nvidia also said Rubin can train certain large models using roughly one-fourth as many chips as Blackwell requires.

The partnership between Uber, Lucid and Nuro plans to launch its robotaxi fleet in San Francisco later this year. Waymo is getting a good look at the competition as Uber revealed the design of its robotaxi that's due to launch in San Francisco later this year. The upcoming robotaxi is a result of a partnership announced in July between Uber, Lucid and Nuro. The plan is still to deploy at least 20,000 Lucid EVs that will use the Nuro Driver autonomous driving tech and be available through the Uber platform. It's important to note that the robotaxi reveal will be a production intent design, so there may be some modifications to the version that will eventually hit the streets.

Grok, a chatbot developed by xAI, has faced criticism for churning out incorrect information about recent crises. Washington - Elon Musk's AI tool Grok faced growing international backlash Monday for generating sexualized deepfakes of women and minors, with the European Union joining the condemnation and Britain warning of an investigation. Complaints of abuse flooded the internet after the recent rollout of an "edit image" button on Grok, which enabled users to alter online images with prompts such as "put her in a bikini" or "remove her clothes." The digital undressing spree, which follows growing concerns among tech campaigners over proliferating AI "nudify" apps, prompted swift probes or calls for remedial action from countries including France, India and Malaysia. In a time of both misinformation and too much information, quality journalism is more crucial than ever. By subscribing, you can help us get the story right.

Google DeepMind and Boston Dynamics are teaming up to integrate Gemini into a humanoid robot called Atlas. Google DeepMind is teaming up with Boston Dynamics to give its humanoid robots the intelligence required to navigate unfamiliar environments and identify and manipulate objects--precisely the kinds of capabilities needed to perform manual labor. The collaboration, announced at CES in Las Vegas, will see Google's Gemini Robotics model deployed on various Boston Dynamics' robots, including a humanoid called Atlas and a robot dog called Spot . The companies plan to test Gemini-powered Atlas robots at auto factories belonging to Hyundai, Boston Dynamics' parent company, in the coming months. The move is an early look at a future where humanoids are able to quickly master a wide range of tasks.

The information war will be fought through chatbots. Hours before President Donald Trump announced Nicolás Maduro's capture, on Saturday morning, people had questions for Grok, Elon Musk's chatbot. Footage was circulating on X of explosions in Venezuela, and some users assumed the United States was responsible: "Hey @grok why is Trump sending US airstrikes to bomb Venezuela. Do you think they deserve it or not?"one "@grok what is the reason why America is bombing Venezuela," another asked.

The motor company is set to show off some impressive robots this year. CES has long felt like a full-on auto show, but the car-centric energy seems somewhat muted at CES 2026 . Sure, the Afeela electric vehicle from the Sony-Honda joint venture is returning to the show floor, but with the Trump administration yanking most EV incentives from the market, the industry isn't offering a full-court press of new vehicles in Las Vegas this year. While the company's Mobis subsidiary will present more than 30 mobility convergence technologies during CES week -- including its Holographic Windshield Display -- we're hearing the Korean auto giant will instead use its press conference to focus on its AI Robotics Strategy . That will apparently include showcasing its new Atlas robot, as well as the wheeled MobED robot line.

EU flags'appalling' child-like deepfakes generated by X's Grok AI The European Commission has condemned the reported spread of explicit, child-like content on social media platform X, calling the material "appalling" and "disgusting". European Union digital affairs spokesman Thomas Regnier made the comments to reporters on Monday following weeks of complaints over a new feature on X's integrated AI chatbot Grok used to generate pornographic content, including depicting children. Regnier said the European Commission is "very seriously looking" into the matter, and such content has "no place in Europe". Meanwhile, the public prosecutor's office in Paris, France expanded an investigation into X to include accusations that Grok - created by Elon Musk's xAI company - has been used to generate and spread child pornography. In late December, a novel "edit image" feature on Grok allowed users to modify any image on the platform.

This African penguin baby will sadly not be named after a hot dog. Breakthroughs, discoveries, and DIY tips sent every weekday. Last December, staff at Adventure Aquarium in Camden, New Jersey, celebrated the arrival of two newly hatched African penguin chicks (). Their births marked a big moment in conservation efforts for the critically endangered species, but even more good news was apparently on the way. Less than a month after welcoming Duffy and Oscar to the flock, Adventure Aquarium has announced newcomer.